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Finding the Fourth Proportional to 145,716.40, 218,531.40 and 56,918.80

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Solution

The fourth proportional to 145,716.40, 218,531.40 and 56,918.80 is: 85,361.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,716.40 : 218,531.40 = 56,918.80 : x
  2. Step 2: Convert to fraction form
    145,716.40/218,531.40 = 56,918.80/x
  3. Step 3: Cross multiply
    145,716.40x = 218,531.40 × 56,918.80
  4. Step 4: Simplify right side
    145,716.40x = 12,438,545,050.32
  5. Step 5: Solve for x
    x = 12,438,545,050.32/145,716.40
  6. Step 6: Final answer
    x = 85,361.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.